Buy Disney Sing It: Pop Hits

I bought this for my 10 year old daughter and I intend to return it asap. The game uses a logitech USB microphone that just doesn't work well with the wii. There's a delay in the microphone signal path that results in your audio coming out of the speakers about 200 milliseconds after you sing it (that's an educated quess). That's enough of a delay to make it basically unusable.

If you care about your childs musical abilities at all, I wouldn't let him or her get used to using this thing as it would probably ruin any sense of timing they might have. Get more detail about Disney Sing It: Pop Hits.